File calamares-desktop-file.patch of Package calamares

* Use xdg-su instead of pkexec.
* Avoid rpmlint warnings about invalid calamares.desktop value "calamares;system;installer":
  for locale string list key "Keywords" in group "Desktop Entry" does not have a semicolon (';') as trailing character

diff --git a/calamares.desktop b/calamares.desktop
--- a/calamares.desktop
+++ b/calamares.desktop
@@ -3,9 +3,9 @@
 Version=1.0
 Name=Calamares
 GenericName=System Installer
-Keywords=calamares;system;installer
+Keywords=calamares;system;installer;
 TryExec=calamares
-Exec=pkexec /usr/bin/calamares
+Exec=xdg-su -c /usr/bin/calamares
 Comment=Calamares — System Installer
 Icon=calamares
 Terminal=false